Apparatus for producing special rayon yarn



y 1959 TAKETO MARUYAMA ET AL 2,896,252

APPARATUS FOR PRODUCING SPECIAL RAYON YARN Filed Feb. 12, 1957 APPARATUSFOR PRODUCING SPECIAL RAYON YARN Taketo Maruyama and Tutae Sakamoto,Otsu-shi, Shiga- Application February 12,1957, Serial No. 639,675

Claims priority, application Japan May 16, 1956 2 Claims. (Cl. 18-8)This invention relates to devices for producing syn thetic yarn, andmore particularly to devices for producing yarn having thin portions andthick portions.

In conventional apparatus for producing rayon yarn of the above-notedtype, a spinning pump and a plunger pump are generally arranged inparallel and thin portions of yarn are formed from liquor supplied bythe spinning pump and thick portions of yarn are formed by adding liquorsupplied by the plunger pump. However, in this operation, the mean sizeand the ratio of the sizes of the thin portions and thick portions aregreatly varied, and due to this fact, it is necessary to stop theoperation from time to time in order to adjust the feeding of the liquorby the plunger and to adjust the ratio of the sizes. It is evident thatthese adjustments decrease the efliciency of the operation and theyields thereof.

In order to eliminate the disadvantages as described above, a spinningpump and a plunger-type amplitude device are arranged in accordance withthe invention in series, and liquor is fed to the amplitude device andthe liquor is spun to form thick and thin portions under the control ofthe amplitude device. More particularly, the liquor is passed to theamplitude device by an ordinary spinning pump and the thin portions ofthe yarn are formed, for example, by an outlet valve maintained slightlyopen while the thick portions of the yarn are formed with liquor whichis fed intermittently to the outlet valve by the reciprocating motion ofthe plunger of the amplitude device. Preferably, the inlet of theamplitude device has no valve and is directly connected to the spinningpump, but a control valve (eg a ball valve, a needle valve, a flatvalve, or the like) is provided at the outlet and supported by a springin such a way that the spring is compressed by the pressure of theliquor to maintain the valve in a slightly open condition in order toprevent the yarn from breaking.

The accompanying drawing illustrates a preferred embodiment of theinvention in order to facilitate the understanding thereof, but it is tobe understood that the invention is not limited to the embodiment shownin the drawing, since it is evident that the embodiment may be alteredin many ways without departing from the spirit and the scope of theinvention.

In the drawings:

Figure 1 is a front view, shown partly in section, of oneof theembodiments of the invention, and

Figure 2 is a side view, shown partly in section along line IIII of Fig.1, of the same apparatus.

In the drawing, a spinning pump or supply device 2 which is adapted tofeed liquor at a constant predetermined rate (for example, a gear pump)is mounted on a pump base 1 and is driven by means of a gear 4 fixed ona driving shaft 3.

Liquor for the yarn is passed through a delivery channel or couplingpipe 5 to a cylinder chamber b in the direction shown by the arrow awhen the spinning pump 2 United States Patent is driven. The liquor thenacts to operate the outlet valve 6 of an amplitude device 15 and passesinto an end base 7 through a pipe c and is ejected from a jet orextrusion device 9 for the spinning operation.

A plunger-type amplitude device 15 for forming thick portions of yarn isprovided, as shown in Figure 2, with a plunger 22 which is adjustablymounted on the top of a lever 17 by an adjustment screw25. The head ofthe plunger 22 is set in a ball-shape dish 11 in member 12 forming thehead of the lever 17. A pin 13 connects lower arm 14 of the amplitudedevice 15 rotatably to lever 17 and a spring 24 connects the lever 17and the arm 14 to pull the lever 17 towards the arm 14 as shown in thedrawing. When the lever 17 is pulled in by the spring 24, the lever 17comes into contact with a stopper 16. The stopper comprises an eccentriccam 16' which is adjustably mounted on a frame 26 by means of a screw27. Accordingly the position of the front end of the stopper 16 andconsequently the magnitude of the stroke of the lever 17 may be minutelyadjusted by turning the cam 16', and thus the amount of the liquorpushed forward by the stroke of the plunger may be accuratelycontrolled. A line shaft 18 is provided with a disc 20 on which aplurality of pins 19 are fixed in any desired relation. When the disc isrotated in the direction of the arrow, as shown in Figure 2, the pin 19comes into engagement with the lower end of the lever 17 to turn saidlever in counter-clockwise direction against the force of the spring 24.Thus, the lever 17 is oscillated intermittently at any desired intervalto move the plunger 22 to draw in liquid or to push the liquid out ofthe cylinder chamber 11 to the jet 9, thus opening further the slightlyopen valve 6 to feed the liquor for forming the thick portions of theyarn intermittently.

The valve 6 is supported by a spring 28 which is pressed downwardly by ascrew 29, and therefore the force of the valve 6 against the liquorpressure may be adjusted by turning the screw 29. When a pin 19 losescontact with the lever 17, the forward pushing operation of the plungeris stopped and the lever 17 returns to its original position under theaction of the spring 24 to contact stopper 16. The forward pushingoperation of the plunger 22 is repeated when the next pin 19 comes intocontact with the lever 17.

The operation described above may be carried out at any desiredintervals whether equal or unequal. For this purpose, the intervalsbetween the pins 19 may be made uniform or different from one another.

The pushing delivery of the additional liquor is carried out by thereciprocating motion of the plunger 22 as described above. When theplunger 22, however, is moving backward, the liquor may tend to flow ina reverse direction. If such a flow occurs, the feeding of the liquorthrough the jet 9 may be stopped or decreased to such an extent as tocause the breaking of the yarn. In order to prevent this, the chamber ofthe valve 6 and the cylinder chamber are directly communicated with thespinning pump 2 so that these chambers will be continuously fed with theliquor and a forward flow of the liquor in an adequate amount throughthe valve 6 always maintained.

In the apparatus of this invention as described above, it will be notedthat the liquor may be pushed forward in order to supply additionalliquor for forming thick portions of the yarn by actuating the valve 6by the plunger intermittently, while a constant feeding of the liquorfor forming the thin portions of the yam is maintained. It will befurther noted that the adjustment of the thick portions of the yarn maybe achieved by turning of the cam 16' of the stopper 16 to adjustminutely the range of the return stroke of the lever 17 and consequentlythe stroke of the plunger 22 thereby adjusting the pulsed supply of thefeeding of the liquor. Thus, the ratio of the sizes between the thickportions and the thin portions of the yarn may be varied. It will bealso noted that the mean size of the yarn is always maintained by thearrangement of the spinning pump and the plunger type amplitude devicein series. It can be easily understood by those experienced in the artthat the apparatus of this invention provides various advantages asdescribed above in the production of special rayon yarn such as slubyarn.

It is to be understood that the embodiments may be varied and modifiedwithout departing from the scope and the spirit of this invention. Forexample, while the explanations have been made in the above withreference to the embodiment in which a plunger pump is employed, a pumpof another type may be used.

What is claimed is:

1. Apparatus for the production of thread of variable denier from aliquid comprising supply means for supplying the liquid under pressure,an extrusion device, coupling means coupling the supply means and theextrusion device and defining a delivery channel therebetween, pressurevarying means coupled to the delivery channel between the supply meansand the extrusion device for alternately increasing and decreasing thepressure of 4 the liquid therein, and a liquid supply control devicecoupled to the delivery channel to maintain a supply of the liquid tothe extrusion device, despite the operation of the pressure varyingmeans, to maintain the continuity of the thread, the liquid supplycontrol device comprising a valve in said delivery channel forcontrolling the flow of liquid therethrough and a spring loading saidvalve and exerting a force thereupon to allow a flow of fluid throughthe delivery channel with the pressure varying means reducing thepressure therein.

2. Apparatus as claimed in claim 1 wherein the pressure varying meansincludes a cylinder opening into the delivery channel, a reciprocatingpiston in the cylinder, a fulcrumed lever pivoted to the piston, anadjustable cam fixed relative to the cylinder, a resilient device urgingthe lever into contact with said cam, and a rotary disc including pinsfor sequentially lifting the lever away from the cam to move saidpiston, said cam limiting the return movement of the piston.

References Cited in the file of this patent UNITED STATES PATENTS

